For the VAE-based approach, if we compare the models trained using SAX and la4Ch data, we can see that there is a slight decrease in accuracy when using la4Ch data. As mentioned in Section REF , the VAESAX results are only reported for comparison to our previous work [1]}. However, this method cannot be directly compared to the proposed MMDL method as it is trained using different data, and paired echocardiography data would not be available for the SAX view. We hypothesize that the difference can be explained by the different regions covered by the two modalities: the SAX data focuses on the basal region of the heart where there is more motion, whilst the la4Ch images focus on a cross section of the heart which may not capture some motion that can be important for CRT response prediction.
